The option to stop Skype from starting automatically is only available in Skype on Windows, Mac and Linux.
- Click your profile picture.
- Click Settings.
- Click General.
- Under Startup and Close, toggle Automatically start Skype to Off.
: The option to stop Skype from automatically starting is not available in Skype for Windows 10 (version 14). To stop Skype from automatically starting, just sign out of the app.